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linuxdebug/drivers/scsi/bnx2i/bnx2i_iscsi.c

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null pointer error
2024-07-16 15:50:57 +02:00
/*
* bnx2i_iscsi.c: QLogic NetXtreme II iSCSI driver.
*
* Copyright (c) 2006 - 2013 Broadcom Corporation
* Copyright (c) 2007, 2008 Red Hat, Inc. All rights reserved.
* Copyright (c) 2007, 2008 Mike Christie
* Copyright (c) 2014, QLogic Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation.
*
* Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
* Previously Maintained by: Eddie Wai (eddie.wai@broadcom.com)
* Maintained by: QLogic-Storage-Upstream@qlogic.com
*/
#include <linux/slab.h>
#include <scsi/scsi_tcq.h>
#include <scsi/libiscsi.h>
#include "bnx2i.h"
struct scsi_transport_template *bnx2i_scsi_xport_template;
struct iscsi_transport bnx2i_iscsi_transport;
static struct scsi_host_template bnx2i_host_template;
/*
* Global endpoint resource info
*/
static DEFINE_SPINLOCK(bnx2i_resc_lock); /* protects global resources */
DECLARE_PER_CPU(struct bnx2i_percpu_s, bnx2i_percpu);
static int bnx2i_adapter_ready(struct bnx2i_hba *hba)
{
int retval = 0;
if (!hba || !test_bit(ADAPTER_STATE_UP, &hba->adapter_state) ||
test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) ||
test_bit(ADAPTER_STATE_LINK_DOWN, &hba->adapter_state))
retval = -EPERM;
return retval;
}
/**
* bnx2i_get_write_cmd_bd_idx - identifies various BD bookmarks
* @cmd: iscsi cmd struct pointer
* @buf_off: absolute buffer offset
* @start_bd_off: u32 pointer to return the offset within the BD
* indicated by 'start_bd_idx' on which 'buf_off' falls
* @start_bd_idx: index of the BD on which 'buf_off' falls
*
* identifies & marks various bd info for scsi command's imm data,
* unsolicited data and the first solicited data seq.
*/
static void bnx2i_get_write_cmd_bd_idx(struct bnx2i_cmd *cmd, u32 buf_off,
u32 *start_bd_off, u32 *start_bd_idx)
{
struct iscsi_bd *bd_tbl = cmd->io_tbl.bd_tbl;
u32 cur_offset = 0;
u32 cur_bd_idx = 0;
if (buf_off) {
while (buf_off >= (cur_offset + bd_tbl->buffer_length)) {
cur_offset += bd_tbl->buffer_length;
cur_bd_idx++;
bd_tbl++;
}
}
*start_bd_off = buf_off - cur_offset;
*start_bd_idx = cur_bd_idx;
}
/**
* bnx2i_setup_write_cmd_bd_info - sets up BD various information
* @task: transport layer's cmd struct pointer
*
* identifies & marks various bd info for scsi command's immediate data,
* unsolicited data and first solicited data seq which includes BD start
* index & BD buf off. his function takes into account iscsi parameter such
* as immediate data and unsolicited data is support on this connection.
*/
static void bnx2i_setup_write_cmd_bd_info(struct iscsi_task *task)
{
struct bnx2i_cmd *cmd = task->dd_data;
u32 start_bd_offset;
u32 start_bd_idx;
u32 buffer_offset = 0;
u32 cmd_len = cmd->req.total_data_transfer_length;
/* if ImmediateData is turned off & IntialR2T is turned on,
* there will be no immediate or unsolicited data, just return.
*/
if (!iscsi_task_has_unsol_data(task) && !task->imm_count)
return;
/* Immediate data */
buffer_offset += task->imm_count;
if (task->imm_count == cmd_len)
return;
if (iscsi_task_has_unsol_data(task)) {
bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
&start_bd_offset, &start_bd_idx);
cmd->req.ud_buffer_offset = start_bd_offset;
cmd->req.ud_start_bd_index = start_bd_idx;
buffer_offset += task->unsol_r2t.data_length;
}
if (buffer_offset != cmd_len) {
bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
&start_bd_offset, &start_bd_idx);
if ((start_bd_offset > task->conn->session->first_burst) ||
(start_bd_idx > scsi_sg_count(cmd->scsi_cmd))) {
int i = 0;
iscsi_conn_printk(KERN_ALERT, task->conn,
"bnx2i- error, buf offset 0x%x "
"bd_valid %d use_sg %d\n",
buffer_offset, cmd->io_tbl.bd_valid,
scsi_sg_count(cmd->scsi_cmd));
for (i = 0; i < cmd->io_tbl.bd_valid; i++)
iscsi_conn_printk(KERN_ALERT, task->conn,
"bnx2i err, bd[%d]: len %x\n",
i, cmd->io_tbl.bd_tbl[i].\
buffer_length);
}
cmd->req.sd_buffer_offset = start_bd_offset;
cmd->req.sd_start_bd_index = start_bd_idx;
}
}
/**
* bnx2i_map_scsi_sg - maps IO buffer and prepares the BD table
* @hba: adapter instance
* @cmd: iscsi cmd struct pointer
*
* map SG list
*/
static int bnx2i_map_scsi_sg(struct bnx2i_hba *hba, struct bnx2i_cmd *cmd)
{
struct scsi_cmnd *sc = cmd->scsi_cmd;
struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;
struct scatterlist *sg;
int byte_count = 0;
int bd_count = 0;
int sg_count;
int sg_len;
u64 addr;
int i;
BUG_ON(scsi_sg_count(sc) > ISCSI_MAX_BDS_PER_CMD);
sg_count = scsi_dma_map(sc);
scsi_for_each_sg(sc, sg, sg_count, i) {
sg_len = sg_dma_len(sg);
addr = (u64) sg_dma_address(sg);
bd[bd_count].buffer_addr_lo = addr & 0xffffffff;
bd[bd_count].buffer_addr_hi = addr >> 32;
bd[bd_count].buffer_length = sg_len;
bd[bd_count].flags = 0;
if (bd_count == 0)
bd[bd_count].flags = ISCSI_BD_FIRST_IN_BD_CHAIN;
byte_count += sg_len;
bd_count++;
}
if (bd_count)
bd[bd_count - 1].flags |= ISCSI_BD_LAST_IN_BD_CHAIN;
BUG_ON(byte_count != scsi_bufflen(sc));
return bd_count;
}
/**
* bnx2i_iscsi_map_sg_list - maps SG list
* @cmd: iscsi cmd struct pointer
*
* creates BD list table for the command
*/
static void bnx2i_iscsi_map_sg_list(struct bnx2i_cmd *cmd)
{
int bd_count;
bd_count = bnx2i_map_scsi_sg(cmd->conn->hba, cmd);
if (!bd_count) {
struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;
bd[0].buffer_addr_lo = bd[0].buffer_addr_hi = 0;
bd[0].buffer_length = bd[0].flags = 0;
}
cmd->io_tbl.bd_valid = bd_count;
}
/**
* bnx2i_iscsi_unmap_sg_list - unmaps SG list
* @cmd: iscsi cmd struct pointer
*
* unmap IO buffers and invalidate the BD table
*/
void bnx2i_iscsi_unmap_sg_list(struct bnx2i_cmd *cmd)
{
struct scsi_cmnd *sc = cmd->scsi_cmd;
if (cmd->io_tbl.bd_valid && sc) {
scsi_dma_unmap(sc);
cmd->io_tbl.bd_valid = 0;
}
}
static void bnx2i_setup_cmd_wqe_template(struct bnx2i_cmd *cmd)
{
memset(&cmd->req, 0x00, sizeof(cmd->req));
cmd->req.op_code = 0xFF;
cmd->req.bd_list_addr_lo = (u32) cmd->io_tbl.bd_tbl_dma;
cmd->req.bd_list_addr_hi =
(u32) ((u64) cmd->io_tbl.bd_tbl_dma >> 32);
}
/**
* bnx2i_bind_conn_to_iscsi_cid - bind conn structure to 'iscsi_cid'
* @hba: pointer to adapter instance
* @bnx2i_conn: pointer to iscsi connection
* @iscsi_cid: iscsi context ID, range 0 - (MAX_CONN - 1)
*
* update iscsi cid table entry with connection pointer. This enables
* driver to quickly get hold of connection structure pointer in
* completion/interrupt thread using iscsi context ID
*/
static int bnx2i_bind_conn_to_iscsi_cid(struct bnx2i_hba *hba,
struct bnx2i_conn *bnx2i_conn,
u32 iscsi_cid)
{
if (hba && hba->cid_que.conn_cid_tbl[iscsi_cid]) {
iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
"conn bind - entry #%d not free\n", iscsi_cid);
return -EBUSY;
}
hba->cid_que.conn_cid_tbl[iscsi_cid] = bnx2i_conn;
return 0;
}
/**
* bnx2i_get_conn_from_id - maps an iscsi cid to corresponding conn ptr
* @hba: pointer to adapter instance
* @iscsi_cid: iscsi context ID, range 0 - (MAX_CONN - 1)
*/
struct bnx2i_conn *bnx2i_get_conn_from_id(struct bnx2i_hba *hba,
u16 iscsi_cid)
{
if (!hba->cid_que.conn_cid_tbl) {
printk(KERN_ERR "bnx2i: ERROR - missing conn<->cid table\n");
return NULL;
} else if (iscsi_cid >= hba->max_active_conns) {
printk(KERN_ERR "bnx2i: wrong cid #%d\n", iscsi_cid);
return NULL;
}
return hba->cid_que.conn_cid_tbl[iscsi_cid];
}
/**
* bnx2i_alloc_iscsi_cid - allocates a iscsi_cid from free pool
* @hba: pointer to adapter instance
*/
static u32 bnx2i_alloc_iscsi_cid(struct bnx2i_hba *hba)
{
int idx;
if (!hba->cid_que.cid_free_cnt)
return -1;
idx = hba->cid_que.cid_q_cons_idx;
hba->cid_que.cid_q_cons_idx++;
if (hba->cid_que.cid_q_cons_idx == hba->cid_que.cid_q_max_idx)
hba->cid_que.cid_q_cons_idx = 0;
hba->cid_que.cid_free_cnt--;
return hba->cid_que.cid_que[idx];
}
/**
* bnx2i_free_iscsi_cid - returns tcp port to free list
* @hba: pointer to adapter instance
* @iscsi_cid: iscsi context ID to free
*/
static void bnx2i_free_iscsi_cid(struct bnx2i_hba *hba, u16 iscsi_cid)
{
int idx;
if (iscsi_cid == (u16) -1)
return;
hba->cid_que.cid_free_cnt++;
idx = hba->cid_que.cid_q_prod_idx;
hba->cid_que.cid_que[idx] = iscsi_cid;
hba->cid_que.conn_cid_tbl[iscsi_cid] = NULL;
hba->cid_que.cid_q_prod_idx++;
if (hba->cid_que.cid_q_prod_idx == hba->cid_que.cid_q_max_idx)
hba->cid_que.cid_q_prod_idx = 0;
}
/**
* bnx2i_setup_free_cid_que - sets up free iscsi cid queue
* @hba: pointer to adapter instance
*
* allocates memory for iscsi cid queue & 'cid - conn ptr' mapping table,
* and initialize table attributes
*/
static int bnx2i_setup_free_cid_que(struct bnx2i_hba *hba)
{
int mem_size;
int i;
mem_size = hba->max_active_conns * sizeof(u32);
mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;
hba->cid_que.cid_que_base = kmalloc(mem_size, GFP_KERNEL);
if (!hba->cid_que.cid_que_base)
return -ENOMEM;
mem_size = hba->max_active_conns * sizeof(struct bnx2i_conn *);
mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;
hba->cid_que.conn_cid_tbl = kmalloc(mem_size, GFP_KERNEL);
if (!hba->cid_que.conn_cid_tbl) {
kfree(hba->cid_que.cid_que_base);
hba->cid_que.cid_que_base = NULL;
return -ENOMEM;
}
hba->cid_que.cid_que = (u32 *)hba->cid_que.cid_que_base;
hba->cid_que.cid_q_prod_idx = 0;
hba->cid_que.cid_q_cons_idx = 0;
hba->cid_que.cid_q_max_idx = hba->max_active_conns;
hba->cid_que.cid_free_cnt = hba->max_active_conns;
for (i = 0; i < hba->max_active_conns; i++) {
hba->cid_que.cid_que[i] = i;
hba->cid_que.conn_cid_tbl[i] = NULL;
}
return 0;
}
/**
* bnx2i_release_free_cid_que - releases 'iscsi_cid' queue resources
* @hba: pointer to adapter instance
*/
static void bnx2i_release_free_cid_que(struct bnx2i_hba *hba)
{
kfree(hba->cid_que.cid_que_base);
hba->cid_que.cid_que_base = NULL;
kfree(hba->cid_que.conn_cid_tbl);
hba->cid_que.conn_cid_tbl = NULL;
}
/**
* bnx2i_alloc_ep - allocates ep structure from global pool
* @hba: pointer to adapter instance
*
* routine allocates a free endpoint structure from global pool and
* a tcp port to be used for this connection. Global resource lock,
* 'bnx2i_resc_lock' is held while accessing shared global data structures
*/
static struct iscsi_endpoint *bnx2i_alloc_ep(struct bnx2i_hba *hba)
{
struct iscsi_endpoint *ep;
struct bnx2i_endpoint *bnx2i_ep;
u32 ec_div;
ep = iscsi_create_endpoint(sizeof(*bnx2i_ep));
if (!ep) {
printk(KERN_ERR "bnx2i: Could not allocate ep\n");
return NULL;
}
bnx2i_ep = ep->dd_data;
bnx2i_ep->cls_ep = ep;
INIT_LIST_HEAD(&bnx2i_ep->link);
bnx2i_ep->state = EP_STATE_IDLE;
bnx2i_ep->ep_iscsi_cid = (u16) -1;
bnx2i_ep->hba = hba;
bnx2i_ep->hba_age = hba->age;
ec_div = event_coal_div;
while (ec_div >>= 1)
bnx2i_ep->ec_shift += 1;
hba->ofld_conns_active++;
init_waitqueue_head(&bnx2i_ep->ofld_wait);
return ep;
}
/**
* bnx2i_free_ep - free endpoint
* @ep: pointer to iscsi endpoint structure
*/
static void bnx2i_free_ep(struct iscsi_endpoint *ep)
{
struct bnx2i_endpoint *bnx2i_ep = ep->dd_data;
unsigned long flags;
spin_lock_irqsave(&bnx2i_resc_lock, flags);
bnx2i_ep->state = EP_STATE_IDLE;
bnx2i_ep->hba->ofld_conns_active--;
if (bnx2i_ep->ep_iscsi_cid != (u16) -1)
bnx2i_free_iscsi_cid(bnx2i_ep->hba, bnx2i_ep->ep_iscsi_cid);
if (bnx2i_ep->conn) {
bnx2i_ep->conn->ep = NULL;
bnx2i_ep->conn = NULL;
}
bnx2i_ep->hba = NULL;
spin_unlock_irqrestore(&bnx2i_resc_lock, flags);
iscsi_destroy_endpoint(ep);
}
/**
* bnx2i_alloc_bdt - allocates buffer descriptor (BD) table for the command
* @hba: adapter instance pointer
* @session: iscsi session pointer
* @cmd: iscsi command structure
*/
static int bnx2i_alloc_bdt(struct bnx2i_hba *hba, struct iscsi_session *session,
struct bnx2i_cmd *cmd)
{
struct io_bdt *io = &cmd->io_tbl;
struct iscsi_bd *bd;
io->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
ISCSI_MAX_BDS_PER_CMD * sizeof(*bd),
&io->bd_tbl_dma, GFP_KERNEL);
if (!io->bd_tbl) {
iscsi_session_printk(KERN_ERR, session, "Could not "
"allocate bdt.\n");
return -ENOMEM;
}
io->bd_valid = 0;
return 0;
}
/**
* bnx2i_destroy_cmd_pool - destroys iscsi command pool and release BD table
* @hba: adapter instance pointer
* @session: iscsi session pointer
*/
static void bnx2i_destroy_cmd_pool(struct bnx2i_hba *hba,
struct iscsi_session *session)
{
int i;
for (i = 0; i < session->cmds_max; i++) {
struct iscsi_task *task = session->cmds[i];
struct bnx2i_cmd *cmd = task->dd_data;
if (cmd->io_tbl.bd_tbl)
dma_free_coherent(&hba->pcidev->dev,
ISCSI_MAX_BDS_PER_CMD *
sizeof(struct iscsi_bd),
cmd->io_tbl.bd_tbl,
cmd->io_tbl.bd_tbl_dma);
}
}
/**
* bnx2i_setup_cmd_pool - sets up iscsi command pool for the session
* @hba: adapter instance pointer
* @session: iscsi session pointer
*/
static int bnx2i_setup_cmd_pool(struct bnx2i_hba *hba,
struct iscsi_session *session)
{
int i;
for (i = 0; i < session->cmds_max; i++) {
struct iscsi_task *task = session->cmds[i];
struct bnx2i_cmd *cmd = task->dd_data;
task->hdr = &cmd->hdr;
task->hdr_max = sizeof(struct iscsi_hdr);
if (bnx2i_alloc_bdt(hba, session, cmd))
goto free_bdts;
}
return 0;
free_bdts:
bnx2i_destroy_cmd_pool(hba, session);
return -ENOMEM;
}
/**
* bnx2i_setup_mp_bdt - allocate BD table resources
* @hba: pointer to adapter structure
*
* Allocate memory for dummy buffer and associated BD
* table to be used by middle path (MP) requests
*/
static int bnx2i_setup_mp_bdt(struct bnx2i_hba *hba)
{
int rc = 0;
struct iscsi_bd *mp_bdt;
u64 addr;
hba->mp_bd_tbl = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
&hba->mp_bd_dma, GFP_KERNEL);
if (!hba->mp_bd_tbl) {
printk(KERN_ERR "unable to allocate Middle Path BDT\n");
rc = -1;
goto out;
}
hba->dummy_buffer = dma_alloc_coherent(&hba->pcidev->dev,
CNIC_PAGE_SIZE,
&hba->dummy_buf_dma, GFP_KERNEL);
if (!hba->dummy_buffer) {
printk(KERN_ERR "unable to alloc Middle Path Dummy Buffer\n");
dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
hba->mp_bd_tbl, hba->mp_bd_dma);
hba->mp_bd_tbl = NULL;
rc = -1;
goto out;
}
mp_bdt = (struct iscsi_bd *) hba->mp_bd_tbl;
addr = (unsigned long) hba->dummy_buf_dma;
mp_bdt->buffer_addr_lo = addr & 0xffffffff;
mp_bdt->buffer_addr_hi = addr >> 32;
mp_bdt->buffer_length = CNIC_PAGE_SIZE;
mp_bdt->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
ISCSI_BD_FIRST_IN_BD_CHAIN;
out:
return rc;
}
/**
* bnx2i_free_mp_bdt - releases ITT back to free pool
* @hba: pointer to adapter instance
*
* free MP dummy buffer and associated BD table
*/
static void bnx2i_free_mp_bdt(struct bnx2i_hba *hba)
{
if (hba->mp_bd_tbl) {
dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
hba->mp_bd_tbl, hba->mp_bd_dma);
hba->mp_bd_tbl = NULL;
}
if (hba->dummy_buffer) {
dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
hba->dummy_buffer, hba->dummy_buf_dma);
hba->dummy_buffer = NULL;
}
return;
}
/**
* bnx2i_drop_session - notifies iscsid of connection error.
* @cls_session: iscsi cls session pointer
*
* This notifies iscsid that there is a error, so it can initiate
* recovery.
*
* This relies on caller using the iscsi class iterator so the object
* is refcounted and does not disapper from under us.
*/
void bnx2i_drop_session(struct iscsi_cls_session *cls_session)
{
iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_CONN_FAILED);
}
/**
* bnx2i_ep_destroy_list_add - add an entry to EP destroy list
* @hba: pointer to adapter instance
* @ep: pointer to endpoint (transport identifier) structure
*
* EP destroy queue manager
*/
static int bnx2i_ep_destroy_list_add(struct bnx2i_hba *hba,
struct bnx2i_endpoint *ep)
{
write_lock_bh(&hba->ep_rdwr_lock);
list_add_tail(&ep->link, &hba->ep_destroy_list);
write_unlock_bh(&hba->ep_rdwr_lock);
return 0;
}
/**
* bnx2i_ep_destroy_list_del - add an entry to EP destroy list
*
* @hba: pointer to adapter instance
* @ep: pointer to endpoint (transport identifier) structure
*
* EP destroy queue manager
*/
static int bnx2i_ep_destroy_list_del(struct bnx2i_hba *hba,
struct bnx2i_endpoint *ep)
{
write_lock_bh(&hba->ep_rdwr_lock);
list_del_init(&ep->link);
write_unlock_bh(&hba->ep_rdwr_lock);
return 0;
}
/**
* bnx2i_ep_ofld_list_add - add an entry to ep offload pending list
* @hba: pointer to adapter instance
* @ep: pointer to endpoint (transport identifier) structure
*
* pending conn offload completion queue manager
*/
static int bnx2i_ep_ofld_list_add(struct bnx2i_hba *hba,
struct bnx2i_endpoint *ep)
{
write_lock_bh(&hba->ep_rdwr_lock);
list_add_tail(&ep->link, &hba->ep_ofld_list);
write_unlock_bh(&hba->ep_rdwr_lock);
return 0;
}
/**
* bnx2i_ep_ofld_list_del - add an entry to ep offload pending list
* @hba: pointer to adapter instance
* @ep: pointer to endpoint (transport identifier) structure
*
* pending conn offload completion queue manager
*/
static int bnx2i_ep_ofld_list_del(struct bnx2i_hba *hba,
struct bnx2i_endpoint *ep)
{
write_lock_bh(&hba->ep_rdwr_lock);
list_del_init(&ep->link);
write_unlock_bh(&hba->ep_rdwr_lock);
return 0;
}
/**
* bnx2i_find_ep_in_ofld_list - find iscsi_cid in pending list of endpoints
*
* @hba: pointer to adapter instance
* @iscsi_cid: iscsi context ID to find
*
*/
struct bnx2i_endpoint *
bnx2i_find_ep_in_ofld_list(struct bnx2i_hba *hba, u32 iscsi_cid)
{
struct list_head *list;
struct list_head *tmp;
struct bnx2i_endpoint *ep = NULL;
read_lock_bh(&hba->ep_rdwr_lock);
list_for_each_safe(list, tmp, &hba->ep_ofld_list) {
ep = (struct bnx2i_endpoint *)list;
if (ep->ep_iscsi_cid == iscsi_cid)
break;
ep = NULL;
}
read_unlock_bh(&hba->ep_rdwr_lock);
if (!ep)
printk(KERN_ERR "l5 cid %d not found\n", iscsi_cid);
return ep;
}
/**
* bnx2i_find_ep_in_destroy_list - find iscsi_cid in destroy list
* @hba: pointer to adapter instance
* @iscsi_cid: iscsi context ID to find
*
*/
struct bnx2i_endpoint *
bnx2i_find_ep_in_destroy_list(struct bnx2i_hba *hba, u32 iscsi_cid)
{
struct list_head *list;
struct list_head *tmp;
struct bnx2i_endpoint *ep = NULL;
read_lock_bh(&hba->ep_rdwr_lock);
list_for_each_safe(list, tmp, &hba->ep_destroy_list) {
ep = (struct bnx2i_endpoint *)list;
if (ep->ep_iscsi_cid == iscsi_cid)
break;
ep = NULL;
}
read_unlock_bh(&hba->ep_rdwr_lock);
if (!ep)
printk(KERN_ERR "l5 cid %d not found\n", iscsi_cid);
return ep;
}
/**
* bnx2i_ep_active_list_add - add an entry to ep active list
* @hba: pointer to adapter instance
* @ep: pointer to endpoint (transport identifier) structure
*
* current active conn queue manager
*/
static void bnx2i_ep_active_list_add(struct bnx2i_hba *hba,
struct bnx2i_endpoint *ep)
{
write_lock_bh(&hba->ep_rdwr_lock);
list_add_tail(&ep->link, &hba->ep_active_list);
write_unlock_bh(&hba->ep_rdwr_lock);
}
/**
* bnx2i_ep_active_list_del - deletes an entry to ep active list
* @hba: pointer to adapter instance
* @ep: pointer to endpoint (transport identifier) structure
*
* current active conn queue manager
*/
static void bnx2i_ep_active_list_del(struct bnx2i_hba *hba,
struct bnx2i_endpoint *ep)
{
write_lock_bh(&hba->ep_rdwr_lock);
list_del_init(&ep->link);
write_unlock_bh(&hba->ep_rdwr_lock);
}
/**
* bnx2i_setup_host_queue_size - assigns shost->can_queue param
* @hba: pointer to adapter instance
* @shost: scsi host pointer
*
* Initializes 'can_queue' parameter based on how many outstanding commands
* the device can handle. Each device 5708/5709/57710 has different
* capabilities
*/
static void bnx2i_setup_host_queue_size(struct bnx2i_hba *hba,
struct Scsi_Host *shost)
{
if (test_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type))
shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
else if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type))
shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5709;
else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_57710;
else
shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
}
/**
* bnx2i_alloc_hba - allocate and init adapter instance
* @cnic: cnic device pointer
*
* allocate & initialize adapter structure and call other
* support routines to do per adapter initialization
*/
struct bnx2i_hba *bnx2i_alloc_hba(struct cnic_dev *cnic)
{
struct Scsi_Host *shost;
struct bnx2i_hba *hba;
shost = iscsi_host_alloc(&bnx2i_host_template, sizeof(*hba), 0);
if (!shost)
return NULL;
shost->dma_boundary = cnic->pcidev->dma_mask;
shost->transportt = bnx2i_scsi_xport_template;
shost->max_id = ISCSI_MAX_CONNS_PER_HBA - 1;
shost->max_channel = 0;
shost->max_lun = 512;
shost->max_cmd_len = 16;
hba = iscsi_host_priv(shost);
hba->shost = shost;
hba->netdev = cnic->netdev;
/* Get PCI related information and update hba struct members */
hba->pcidev = cnic->pcidev;
pci_dev_get(hba->pcidev);
hba->pci_did = hba->pcidev->device;
hba->pci_vid = hba->pcidev->vendor;
hba->pci_sdid = hba->pcidev->subsystem_device;
hba->pci_svid = hba->pcidev->subsystem_vendor;
hba->pci_func = PCI_FUNC(hba->pcidev->devfn);
hba->pci_devno = PCI_SLOT(hba->pcidev->devfn);
bnx2i_identify_device(hba, cnic);
bnx2i_setup_host_queue_size(hba, shost);
hba->reg_base = pci_resource_start(hba->pcidev, 0);
if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type)) {
hba->regview = pci_iomap(hba->pcidev, 0, BNX2_MQ_CONFIG2);
if (!hba->regview)
goto ioreg_map_err;
} else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
hba->regview = pci_iomap(hba->pcidev, 0, 4096);
if (!hba->regview)
goto ioreg_map_err;
}
if (bnx2i_setup_mp_bdt(hba))
goto mp_bdt_mem_err;
INIT_LIST_HEAD(&hba->ep_ofld_list);
INIT_LIST_HEAD(&hba->ep_active_list);
INIT_LIST_HEAD(&hba->ep_destroy_list);
rwlock_init(&hba->ep_rdwr_lock);
hba->mtu_supported = BNX2I_MAX_MTU_SUPPORTED;
/* different values for 5708/5709/57710 */
hba->max_active_conns = ISCSI_MAX_CONNS_PER_HBA;
if (bnx2i_setup_free_cid_que(hba))
goto cid_que_err;
/* SQ/RQ/CQ size can be changed via sysfx interface */
if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
if (sq_size && sq_size <= BNX2I_5770X_SQ_WQES_MAX)
hba->max_sqes = sq_size;
else
hba->max_sqes = BNX2I_5770X_SQ_WQES_DEFAULT;
} else { /* 5706/5708/5709 */
if (sq_size && sq_size <= BNX2I_570X_SQ_WQES_MAX)
hba->max_sqes = sq_size;
else
hba->max_sqes = BNX2I_570X_SQ_WQES_DEFAULT;
}
hba->max_rqes = rq_size;
hba->max_cqes = hba->max_sqes + rq_size;
if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
if (hba->max_cqes > BNX2I_5770X_CQ_WQES_MAX)
hba->max_cqes = BNX2I_5770X_CQ_WQES_MAX;
} else if (hba->max_cqes > BNX2I_570X_CQ_WQES_MAX)
hba->max_cqes = BNX2I_570X_CQ_WQES_MAX;
hba->num_ccell = hba->max_sqes / 2;
spin_lock_init(&hba->lock);
mutex_init(&hba->net_dev_lock);
init_waitqueue_head(&hba->eh_wait);
if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
hba->hba_shutdown_tmo = 30 * HZ;
hba->conn_teardown_tmo = 20 * HZ;
hba->conn_ctx_destroy_tmo = 6 * HZ;
} else { /* 5706/5708/5709 */
hba->hba_shutdown_tmo = 20 * HZ;
hba->conn_teardown_tmo = 10 * HZ;
hba->conn_ctx_destroy_tmo = 2 * HZ;
}
#ifdef CONFIG_32BIT
spin_lock_init(&hba->stat_lock);
#endif
memset(&hba->stats, 0, sizeof(struct iscsi_stats_info));
if (iscsi_host_add(shost, &hba->pcidev->dev))
goto free_dump_mem;
return hba;
free_dump_mem:
bnx2i_release_free_cid_que(hba);
cid_que_err:
bnx2i_free_mp_bdt(hba);
mp_bdt_mem_err:
if (hba->regview) {
pci_iounmap(hba->pcidev, hba->regview);
hba->regview = NULL;
}
ioreg_map_err:
pci_dev_put(hba->pcidev);
scsi_host_put(shost);
return NULL;
}
/**
* bnx2i_free_hba- releases hba structure and resources held by the adapter
* @hba: pointer to adapter instance
*
* free adapter structure and call various cleanup routines.
*/
void bnx2i_free_hba(struct bnx2i_hba *hba)
{
struct Scsi_Host *shost = hba->shost;
iscsi_host_remove(shost, false);
INIT_LIST_HEAD(&hba->ep_ofld_list);
INIT_LIST_HEAD(&hba->ep_active_list);
INIT_LIST_HEAD(&hba->ep_destroy_list);
if (hba->regview) {
pci_iounmap(hba->pcidev, hba->regview);
hba->regview = NULL;
}
pci_dev_put(hba->pcidev);
bnx2i_free_mp_bdt(hba);
bnx2i_release_free_cid_que(hba);
iscsi_host_free(shost);
}
/**
* bnx2i_conn_free_login_resources - free DMA resources used for login process
* @hba: pointer to adapter instance
* @bnx2i_conn: iscsi connection pointer
*
* Login related resources, mostly BDT & payload DMA memory is freed
*/
static void bnx2i_conn_free_login_resources(struct bnx2i_hba *hba,
struct bnx2i_conn *bnx2i_conn)
{
if (bnx2i_conn->gen_pdu.resp_bd_tbl) {
dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
bnx2i_conn->gen_pdu.resp_bd_tbl,
bnx2i_conn->gen_pdu.resp_bd_dma);
bnx2i_conn->gen_pdu.resp_bd_tbl = NULL;
}
if (bnx2i_conn->gen_pdu.req_bd_tbl) {
dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
bnx2i_conn->gen_pdu.req_bd_tbl,
bnx2i_conn->gen_pdu.req_bd_dma);
bnx2i_conn->gen_pdu.req_bd_tbl = NULL;
}
if (bnx2i_conn->gen_pdu.resp_buf) {
dma_free_coherent(&hba->pcidev->dev,
ISCSI_DEF_MAX_RECV_SEG_LEN,
bnx2i_conn->gen_pdu.resp_buf,
bnx2i_conn->gen_pdu.resp_dma_addr);
bnx2i_conn->gen_pdu.resp_buf = NULL;
}
if (bnx2i_conn->gen_pdu.req_buf) {
dma_free_coherent(&hba->pcidev->dev,
ISCSI_DEF_MAX_RECV_SEG_LEN,
bnx2i_conn->gen_pdu.req_buf,
bnx2i_conn->gen_pdu.req_dma_addr);
bnx2i_conn->gen_pdu.req_buf = NULL;
}
}
/**
* bnx2i_conn_alloc_login_resources - alloc DMA resources for login/nop.
* @hba: pointer to adapter instance
* @bnx2i_conn: iscsi connection pointer
*
* Mgmt task DNA resources are allocated in this routine.
*/
static int bnx2i_conn_alloc_login_resources(struct bnx2i_hba *hba,
struct bnx2i_conn *bnx2i_conn)
{
/* Allocate memory for login request/response buffers */
bnx2i_conn->gen_pdu.req_buf =
dma_alloc_coherent(&hba->pcidev->dev,
ISCSI_DEF_MAX_RECV_SEG_LEN,
&bnx2i_conn->gen_pdu.req_dma_addr,
GFP_KERNEL);
if (bnx2i_conn->gen_pdu.req_buf == NULL)
goto login_req_buf_failure;
bnx2i_conn->gen_pdu.req_buf_size = 0;
bnx2i_conn->gen_pdu.req_wr_ptr = bnx2i_conn->gen_pdu.req_buf;
bnx2i_conn->gen_pdu.resp_buf =
dma_alloc_coherent(&hba->pcidev->dev,
ISCSI_DEF_MAX_RECV_SEG_LEN,
&bnx2i_conn->gen_pdu.resp_dma_addr,
GFP_KERNEL);
if (bnx2i_conn->gen_pdu.resp_buf == NULL)
goto login_resp_buf_failure;
bnx2i_conn->gen_pdu.resp_buf_size = ISCSI_DEF_MAX_RECV_SEG_LEN;
bnx2i_conn->gen_pdu.resp_wr_ptr = bnx2i_conn->gen_pdu.resp_buf;
bnx2i_conn->gen_pdu.req_bd_tbl =
dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
&bnx2i_conn->gen_pdu.req_bd_dma, GFP_KERNEL);
if (bnx2i_conn->gen_pdu.req_bd_tbl == NULL)
goto login_req_bd_tbl_failure;
bnx2i_conn->gen_pdu.resp_bd_tbl =
dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
&bnx2i_conn->gen_pdu.resp_bd_dma,
GFP_KERNEL);
if (bnx2i_conn->gen_pdu.resp_bd_tbl == NULL)
goto login_resp_bd_tbl_failure;
return 0;
login_resp_bd_tbl_failure:
dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
bnx2i_conn->gen_pdu.req_bd_tbl,
bnx2i_conn->gen_pdu.req_bd_dma);
bnx2i_conn->gen_pdu.req_bd_tbl = NULL;
login_req_bd_tbl_failure:
dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
bnx2i_conn->gen_pdu.resp_buf,
bnx2i_conn->gen_pdu.resp_dma_addr);
bnx2i_conn->gen_pdu.resp_buf = NULL;
login_resp_buf_failure:
dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
bnx2i_conn->gen_pdu.req_buf,
bnx2i_conn->gen_pdu.req_dma_addr);
bnx2i_conn->gen_pdu.req_buf = NULL;
login_req_buf_failure:
iscsi_conn_printk(KERN_ERR, bnx2i_conn->cls_conn->dd_data,
"login resource alloc failed!!\n");
return -ENOMEM;
}
/**
* bnx2i_iscsi_prep_generic_pdu_bd - prepares BD table.
* @bnx2i_conn: iscsi connection pointer
*
* Allocates buffers and BD tables before shipping requests to cnic
* for PDUs prepared by 'iscsid' daemon
*/
static void bnx2i_iscsi_prep_generic_pdu_bd(struct bnx2i_conn *bnx2i_conn)
{
struct iscsi_bd *bd_tbl;
bd_tbl = (struct iscsi_bd *) bnx2i_conn->gen_pdu.req_bd_tbl;
bd_tbl->buffer_addr_hi =
(u32) ((u64) bnx2i_conn->gen_pdu.req_dma_addr >> 32);
bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.req_dma_addr;
bd_tbl->buffer_length = bnx2i_conn->gen_pdu.req_wr_ptr -
bnx2i_conn->gen_pdu.req_buf;
bd_tbl->reserved0 = 0;
bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
ISCSI_BD_FIRST_IN_BD_CHAIN;
bd_tbl = (struct iscsi_bd *) bnx2i_conn->gen_pdu.resp_bd_tbl;
bd_tbl->buffer_addr_hi = (u64) bnx2i_conn->gen_pdu.resp_dma_addr >> 32;
bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.resp_dma_addr;
bd_tbl->buffer_length = ISCSI_DEF_MAX_RECV_SEG_LEN;
bd_tbl->reserved0 = 0;
bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
ISCSI_BD_FIRST_IN_BD_CHAIN;
}
/**
* bnx2i_iscsi_send_generic_request - called to send mgmt tasks.
* @task: transport layer task pointer
*
* called to transmit PDUs prepared by the 'iscsid' daemon. iSCSI login,
* Nop-out and Logout requests flow through this path.
*/
static int bnx2i_iscsi_send_generic_request(struct iscsi_task *task)
{
struct bnx2i_cmd *cmd = task->dd_data;
struct bnx2i_conn *bnx2i_conn = cmd->conn;
int rc = 0;
char *buf;
int data_len;
bnx2i_iscsi_prep_generic_pdu_bd(bnx2i_conn);
switch (task->hdr->opcode & ISCSI_OPCODE_MASK) {
case ISCSI_OP_LOGIN:
bnx2i_send_iscsi_login(bnx2i_conn, task);
break;
case ISCSI_OP_NOOP_OUT:
data_len = bnx2i_conn->gen_pdu.req_buf_size;
buf = bnx2i_conn->gen_pdu.req_buf;
if (data_len)
rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
buf, data_len, 1);
else
rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
NULL, 0, 1);
break;
case ISCSI_OP_LOGOUT:
rc = bnx2i_send_iscsi_logout(bnx2i_conn, task);
break;
case ISCSI_OP_SCSI_TMFUNC:
rc = bnx2i_send_iscsi_tmf(bnx2i_conn, task);
break;
case ISCSI_OP_TEXT:
rc = bnx2i_send_iscsi_text(bnx2i_conn, task);
break;
default:
iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
"send_gen: unsupported op 0x%x\n",
task->hdr->opcode);
}
return rc;
}
/**********************************************************************
* SCSI-ML Interface
**********************************************************************/
/**
* bnx2i_cpy_scsi_cdb - copies LUN & CDB fields in required format to sq wqe
* @sc: SCSI-ML command pointer
* @cmd: iscsi cmd pointer
*/
static void bnx2i_cpy_scsi_cdb(struct scsi_cmnd *sc, struct bnx2i_cmd *cmd)
{
u32 dword;
int lpcnt;
u8 *srcp;
u32 *dstp;
u32 scsi_lun[2];
int_to_scsilun(sc->device->lun, (struct scsi_lun *) scsi_lun);
cmd->req.lun[0] = be32_to_cpu(scsi_lun[0]);
cmd->req.lun[1] = be32_to_cpu(scsi_lun[1]);
lpcnt = cmd->scsi_cmd->cmd_len / sizeof(dword);
srcp = (u8 *) sc->cmnd;
dstp = (u32 *) cmd->req.cdb;
while (lpcnt--) {
memcpy(&dword, (const void *) srcp, 4);
*dstp = cpu_to_be32(dword);
srcp += 4;
dstp++;
}
if (sc->cmd_len & 0x3) {
dword = (u32) srcp[0] | ((u32) srcp[1] << 8);
*dstp = cpu_to_be32(dword);
}
}
static void bnx2i_cleanup_task(struct iscsi_task *task)
{
struct iscsi_conn *conn = task->conn;
struct bnx2i_conn *bnx2i_conn = conn->dd_data;
struct bnx2i_hba *hba = bnx2i_conn->hba;
/*
* mgmt task or cmd was never sent to us to transmit.
*/
if (!task->sc || task->state == ISCSI_TASK_PENDING)
return;
/*
* need to clean-up task context to claim dma buffers
*/
if (task->state == ISCSI_TASK_ABRT_TMF) {
bnx2i_send_cmd_cleanup_req(hba, task->dd_data);
spin_unlock_bh(&conn->session->back_lock);
wait_for_completion_timeout(&bnx2i_conn->cmd_cleanup_cmpl,
msecs_to_jiffies(ISCSI_CMD_CLEANUP_TIMEOUT));
spin_lock_bh(&conn->session->back_lock);
}
bnx2i_iscsi_unmap_sg_list(task->dd_data);
}
/**
* bnx2i_mtask_xmit - transmit mtask to chip for further processing
* @conn: transport layer conn structure pointer
* @task: transport layer command structure pointer
*/
static int
bnx2i_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
{
struct bnx2i_conn *bnx2i_conn = conn->dd_data;
struct bnx2i_hba *hba = bnx2i_conn->hba;
struct bnx2i_cmd *cmd = task->dd_data;
memset(bnx2i_conn->gen_pdu.req_buf, 0, ISCSI_DEF_MAX_RECV_SEG_LEN);
bnx2i_setup_cmd_wqe_template(cmd);
bnx2i_conn->gen_pdu.req_buf_size = task->data_count;
/* Tx PDU/data length count */
ADD_STATS_64(hba, tx_pdus, 1);
ADD_STATS_64(hba, tx_bytes, task->data_count);
if (task->data_count) {
memcpy(bnx2i_conn->gen_pdu.req_buf, task->data,
task->data_count);
bnx2i_conn->gen_pdu.req_wr_ptr =
bnx2i_conn->gen_pdu.req_buf + task->data_count;
}
cmd->conn = conn->dd_data;
cmd->scsi_cmd = NULL;
return bnx2i_iscsi_send_generic_request(task);
}
/**
* bnx2i_task_xmit - transmit iscsi command to chip for further processing
* @task: transport layer command structure pointer
*
* maps SG buffers and send request to chip/firmware in the form of SQ WQE
*/
static int bnx2i_task_xmit(struct iscsi_task *task)
{
struct iscsi_conn *conn = task->conn;
struct iscsi_session *session = conn->session;
struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
struct bnx2i_hba *hba = iscsi_host_priv(shost);
struct bnx2i_conn *bnx2i_conn = conn->dd_data;
struct scsi_cmnd *sc = task->sc;
struct bnx2i_cmd *cmd = task->dd_data;
struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
if (atomic_read(&bnx2i_conn->ep->num_active_cmds) + 1 >
hba->max_sqes)
return -ENOMEM;
/*
* If there is no scsi_cmnd this must be a mgmt task
*/
if (!sc)
return bnx2i_mtask_xmit(conn, task);
bnx2i_setup_cmd_wqe_template(cmd);
cmd->req.op_code = ISCSI_OP_SCSI_CMD;
cmd->conn = bnx2i_conn;
cmd->scsi_cmd = sc;
cmd->req.total_data_transfer_length = scsi_bufflen(sc);
cmd->req.cmd_sn = be32_to_cpu(hdr->cmdsn);
bnx2i_iscsi_map_sg_list(cmd);
bnx2i_cpy_scsi_cdb(sc, cmd);
cmd->req.op_attr = ISCSI_ATTR_SIMPLE;
if (sc->sc_data_direction == DMA_TO_DEVICE) {
cmd->req.op_attr |= ISCSI_CMD_REQUEST_WRITE;
cmd->req.itt = task->itt |
(ISCSI_TASK_TYPE_WRITE << ISCSI_CMD_REQUEST_TYPE_SHIFT);
bnx2i_setup_write_cmd_bd_info(task);
} else {
if (scsi_bufflen(sc))
cmd->req.op_attr |= ISCSI_CMD_REQUEST_READ;
cmd->req.itt = task->itt |
(ISCSI_TASK_TYPE_READ << ISCSI_CMD_REQUEST_TYPE_SHIFT);
}
cmd->req.num_bds = cmd->io_tbl.bd_valid;
if (!cmd->io_tbl.bd_valid) {
cmd->req.bd_list_addr_lo = (u32) hba->mp_bd_dma;
cmd->req.bd_list_addr_hi = (u32) ((u64) hba->mp_bd_dma >> 32);
cmd->req.num_bds = 1;
}
bnx2i_send_iscsi_scsicmd(bnx2i_conn, cmd);
return 0;
}
/**
* bnx2i_session_create - create a new iscsi session
* @ep: pointer to iscsi endpoint
* @cmds_max: user specified maximum commands
* @qdepth: scsi queue depth to support
* @initial_cmdsn: initial iscsi CMDSN to be used for this session
*
* Creates a new iSCSI session instance on given device.
*/
static struct iscsi_cls_session *
bnx2i_session_create(struct iscsi_endpoint *ep,
uint16_t cmds_max, uint16_t qdepth,
uint32_t initial_cmdsn)
{
struct Scsi_Host *shost;
struct iscsi_cls_session *cls_session;
struct bnx2i_hba *hba;
struct bnx2i_endpoint *bnx2i_ep;
if (!ep) {
printk(KERN_ERR "bnx2i: missing ep.\n");
return NULL;
}
bnx2i_ep = ep->dd_data;
shost = bnx2i_ep->hba->shost;
hba = iscsi_host_priv(shost);
if (bnx2i_adapter_ready(hba))
return NULL;
/*
* user can override hw limit as long as it is within
* the min/max.
*/
if (cmds_max > hba->max_sqes)
cmds_max = hba->max_sqes;
else if (cmds_max < BNX2I_SQ_WQES_MIN)
cmds_max = BNX2I_SQ_WQES_MIN;
cls_session = iscsi_session_setup(&bnx2i_iscsi_transport, shost,
cmds_max, 0, sizeof(struct bnx2i_cmd),
initial_cmdsn, ISCSI_MAX_TARGET);
if (!cls_session)
return NULL;
if (bnx2i_setup_cmd_pool(hba, cls_session->dd_data))
goto session_teardown;
return cls_session;
session_teardown:
iscsi_session_teardown(cls_session);
return NULL;
}
/**
* bnx2i_session_destroy - destroys iscsi session
* @cls_session: pointer to iscsi cls session
*
* Destroys previously created iSCSI session instance and releases
* all resources held by it
*/
static void bnx2i_session_destroy(struct iscsi_cls_session *cls_session)
{
struct iscsi_session *session = cls_session->dd_data;
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
struct bnx2i_hba *hba = iscsi_host_priv(shost);
bnx2i_destroy_cmd_pool(hba, session);
iscsi_session_teardown(cls_session);
}
/**
* bnx2i_conn_create - create iscsi connection instance
* @cls_session: pointer to iscsi cls session
* @cid: iscsi cid as per rfc (not NX2's CID terminology)
*
* Creates a new iSCSI connection instance for a given session
*/
static struct iscsi_cls_conn *
bnx2i_conn_create(struct iscsi_cls_session *cls_session, uint32_t cid)
{
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
struct bnx2i_hba *hba = iscsi_host_priv(shost);
struct bnx2i_conn *bnx2i_conn;
struct iscsi_cls_conn *cls_conn;
struct iscsi_conn *conn;
cls_conn = iscsi_conn_setup(cls_session, sizeof(*bnx2i_conn),
cid);
if (!cls_conn)
return NULL;
conn = cls_conn->dd_data;
bnx2i_conn = conn->dd_data;
bnx2i_conn->cls_conn = cls_conn;
bnx2i_conn->hba = hba;
atomic_set(&bnx2i_conn->work_cnt, 0);
/* 'ep' ptr will be assigned in bind() call */
bnx2i_conn->ep = NULL;
init_completion(&bnx2i_conn->cmd_cleanup_cmpl);
if (bnx2i_conn_alloc_login_resources(hba, bnx2i_conn)) {
iscsi_conn_printk(KERN_ALERT, conn,
"conn_new: login resc alloc failed!!\n");
goto free_conn;
}
return cls_conn;
free_conn:
iscsi_conn_teardown(cls_conn);
return NULL;
}
/**
* bnx2i_conn_bind - binds iscsi sess, conn and ep objects together
* @cls_session: pointer to iscsi cls session
* @cls_conn: pointer to iscsi cls conn
* @transport_fd: 64-bit EP handle
* @is_leading: leading connection on this session?
*
* Binds together iSCSI session instance, iSCSI connection instance
* and the TCP connection. This routine returns error code if
* TCP connection does not belong on the device iSCSI sess/conn
* is bound
*/
static int bnx2i_conn_bind(struct iscsi_cls_session *cls_session,
struct iscsi_cls_conn *cls_conn,
uint64_t transport_fd, int is_leading)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct bnx2i_conn *bnx2i_conn = conn->dd_data;
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
struct bnx2i_hba *hba = iscsi_host_priv(shost);
struct bnx2i_endpoint *bnx2i_ep;
struct iscsi_endpoint *ep;
int ret_code;
ep = iscsi_lookup_endpoint(transport_fd);
if (!ep)
return -EINVAL;
/*
* Forcefully terminate all in progress connection recovery at the
* earliest, either in bind(), send_pdu(LOGIN), or conn_start()
*/
if (bnx2i_adapter_ready(hba)) {
ret_code = -EIO;
goto put_ep;
}
bnx2i_ep = ep->dd_data;
if ((bnx2i_ep->state == EP_STATE_TCP_FIN_RCVD) ||
(bnx2i_ep->state == EP_STATE_TCP_RST_RCVD)) {
/* Peer disconnect via' FIN or RST */
ret_code = -EINVAL;
goto put_ep;
}
if (iscsi_conn_bind(cls_session, cls_conn, is_leading)) {
ret_code = -EINVAL;
goto put_ep;
}
if (bnx2i_ep->hba != hba) {
/* Error - TCP connection does not belong to this device
*/
iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
"conn bind, ep=0x%p (%s) does not",
bnx2i_ep, bnx2i_ep->hba->netdev->name);
iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
"belong to hba (%s)\n",
hba->netdev->name);
ret_code = -EEXIST;
goto put_ep;
}
bnx2i_ep->conn = bnx2i_conn;
bnx2i_conn->ep = bnx2i_ep;
bnx2i_conn->iscsi_conn_cid = bnx2i_ep->ep_iscsi_cid;
bnx2i_conn->fw_cid = bnx2i_ep->ep_cid;
ret_code = bnx2i_bind_conn_to_iscsi_cid(hba, bnx2i_conn,
bnx2i_ep->ep_iscsi_cid);
/* 5706/5708/5709 FW takes RQ as full when initiated, but for 57710
* driver needs to explicitly replenish RQ index during setup.
*/
if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
bnx2i_put_rq_buf(bnx2i_conn, 0);
bnx2i_arm_cq_event_coalescing(bnx2i_conn->ep, CNIC_ARM_CQE);
put_ep:
iscsi_put_endpoint(ep);
return ret_code;
}
/**
* bnx2i_conn_destroy - destroy iscsi connection instance & release resources
* @cls_conn: pointer to iscsi cls conn
*
* Destroy an iSCSI connection instance and release memory resources held by
* this connection
*/
static void bnx2i_conn_destroy(struct iscsi_cls_conn *cls_conn)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct bnx2i_conn *bnx2i_conn = conn->dd_data;
struct Scsi_Host *shost;
struct bnx2i_hba *hba;
struct bnx2i_work *work, *tmp;
unsigned cpu = 0;
struct bnx2i_percpu_s *p;
shost = iscsi_session_to_shost(iscsi_conn_to_session(cls_conn));
hba = iscsi_host_priv(shost);
bnx2i_conn_free_login_resources(hba, bnx2i_conn);
if (atomic_read(&bnx2i_conn->work_cnt)) {
for_each_online_cpu(cpu) {
p = &per_cpu(bnx2i_percpu, cpu);
spin_lock_bh(&p->p_work_lock);
list_for_each_entry_safe(work, tmp,
&p->work_list, list) {
if (work->session == conn->session &&
work->bnx2i_conn == bnx2i_conn) {
list_del_init(&work->list);
kfree(work);
if (!atomic_dec_and_test(
&bnx2i_conn->work_cnt))
break;
}
}
spin_unlock_bh(&p->p_work_lock);
}
}
iscsi_conn_teardown(cls_conn);
}
/**
* bnx2i_ep_get_param - return iscsi ep parameter to caller
* @ep: pointer to iscsi endpoint
* @param: parameter type identifier
* @buf: buffer pointer
*
* returns iSCSI ep parameters
*/
static int bnx2i_ep_get_param(struct iscsi_endpoint *ep,
enum iscsi_param param, char *buf)
{
struct bnx2i_endpoint *bnx2i_ep = ep->dd_data;
struct bnx2i_hba *hba = bnx2i_ep->hba;
int len = -ENOTCONN;
if (!hba)
return -ENOTCONN;
switch (param) {
case ISCSI_PARAM_CONN_PORT:
mutex_lock(&hba->net_dev_lock);
if (bnx2i_ep->cm_sk)
len = sprintf(buf, "%hu\n", bnx2i_ep->cm_sk->dst_port);
mutex_unlock(&hba->net_dev_lock);
break;
case ISCSI_PARAM_CONN_ADDRESS:
mutex_lock(&hba->net_dev_lock);
if (bnx2i_ep->cm_sk)
len = sprintf(buf, "%pI4\n", &bnx2i_ep->cm_sk->dst_ip);
mutex_unlock(&hba->net_dev_lock);
break;
default:
return -ENOSYS;
}
return len;
}
/**
* bnx2i_host_get_param - returns host (adapter) related parameters
* @shost: scsi host pointer
* @param: parameter type identifier
* @buf: buffer pointer
*/
static int bnx2i_host_get_param(struct Scsi_Host *shost,
enum iscsi_host_param param, char *buf)
{
struct bnx2i_hba *hba = iscsi_host_priv(shost);
int len = 0;
switch (param) {
case ISCSI_HOST_PARAM_HWADDRESS:
len = sysfs_format_mac(buf, hba->cnic->mac_addr, 6);
break;
case ISCSI_HOST_PARAM_NETDEV_NAME:
len = sprintf(buf, "%s\n", hba->netdev->name);
break;
case ISCSI_HOST_PARAM_IPADDRESS: {
struct list_head *active_list = &hba->ep_active_list;
read_lock_bh(&hba->ep_rdwr_lock);
if (!list_empty(&hba->ep_active_list)) {
struct bnx2i_endpoint *bnx2i_ep;
struct cnic_sock *csk;
bnx2i_ep = list_first_entry(active_list,
struct bnx2i_endpoint,
link);
csk = bnx2i_ep->cm_sk;
if (test_bit(SK_F_IPV6, &csk->flags))
len = sprintf(buf, "%pI6\n", csk->src_ip);
else
len = sprintf(buf, "%pI4\n", csk->src_ip);
}
read_unlock_bh(&hba->ep_rdwr_lock);
break;
}
default:
return iscsi_host_get_param(shost, param, buf);
}
return len;
}
/**
* bnx2i_conn_start - completes iscsi connection migration to FFP
* @cls_conn: pointer to iscsi cls conn
*
* last call in FFP migration to handover iscsi conn to the driver
*/
static int bnx2i_conn_start(struct iscsi_cls_conn *cls_conn)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct bnx2i_conn *bnx2i_conn = conn->dd_data;
bnx2i_conn->ep->state = EP_STATE_ULP_UPDATE_START;
bnx2i_update_iscsi_conn(conn);
/*
* this should normally not sleep for a long time so it should
* not disrupt the caller.
*/
timer_setup(&bnx2i_conn->ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
bnx2i_conn->ep->ofld_timer.expires = 1 * HZ + jiffies;
add_timer(&bnx2i_conn->ep->ofld_timer);
/* update iSCSI context for this conn, wait for CNIC to complete */
wait_event_interruptible(bnx2i_conn->ep->ofld_wait,
bnx2i_conn->ep->state != EP_STATE_ULP_UPDATE_START);
if (signal_pending(current))
flush_signals(current);
del_timer_sync(&bnx2i_conn->ep->ofld_timer);
iscsi_conn_start(cls_conn);
return 0;
}
/**
* bnx2i_conn_get_stats - returns iSCSI stats
* @cls_conn: pointer to iscsi cls conn
* @stats: pointer to iscsi statistic struct
*/
static void bnx2i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
struct iscsi_stats *stats)
{
struct iscsi_conn *conn = cls_conn->dd_data;
stats->txdata_octets = conn->txdata_octets;
stats->rxdata_octets = conn->rxdata_octets;
stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
stats->dataout_pdus = conn->dataout_pdus_cnt;
stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
stats->datain_pdus = conn->datain_pdus_cnt;
stats->r2t_pdus = conn->r2t_pdus_cnt;
stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
stats->digest_err = 0;
stats->timeout_err = 0;
strcpy(stats->custom[0].desc, "eh_abort_cnt");
stats->custom[0].value = conn->eh_abort_cnt;
stats->custom_length = 1;
}
/**
* bnx2i_check_route - checks if target IP route belongs to one of NX2 devices
* @dst_addr: target IP address
*
* check if route resolves to BNX2 device
*/
static struct bnx2i_hba *bnx2i_check_route(struct sockaddr *dst_addr)
{
struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
struct bnx2i_hba *hba;
struct cnic_dev *cnic = NULL;
hba = get_adapter_list_head();
if (hba && hba->cnic)
cnic = hba->cnic->cm_select_dev(desti, CNIC_ULP_ISCSI);
if (!cnic) {
printk(KERN_ALERT "bnx2i: no route,"
"can't connect using cnic\n");
goto no_nx2_route;
}
hba = bnx2i_find_hba_for_cnic(cnic);
if (!hba)
goto no_nx2_route;
if (bnx2i_adapter_ready(hba)) {
printk(KERN_ALERT "bnx2i: check route, hba not found\n");
goto no_nx2_route;
}
if (hba->netdev->mtu > hba->mtu_supported) {
printk(KERN_ALERT "bnx2i: %s network i/f mtu is set to %d\n",
hba->netdev->name, hba->netdev->mtu);
printk(KERN_ALERT "bnx2i: iSCSI HBA can support mtu of %d\n",
hba->mtu_supported);
goto no_nx2_route;
}
return hba;
no_nx2_route:
return NULL;
}
/**
* bnx2i_tear_down_conn - tear down iscsi/tcp connection and free resources
* @hba: pointer to adapter instance
* @ep: endpoint (transport identifier) structure
*
* destroys cm_sock structure and on chip iscsi context
*/
static int bnx2i_tear_down_conn(struct bnx2i_hba *hba,
struct bnx2i_endpoint *ep)
{
if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic) && ep->cm_sk)
hba->cnic->cm_destroy(ep->cm_sk);
if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type) &&
ep->state == EP_STATE_DISCONN_TIMEDOUT) {
if (ep->conn && ep->conn->cls_conn &&
ep->conn->cls_conn->dd_data) {
struct iscsi_conn *conn = ep->conn->cls_conn->dd_data;
/* Must suspend all rx queue activity for this ep */
set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
}
/* CONN_DISCONNECT timeout may or may not be an issue depending
* on what transcribed in TCP layer, different targets behave
* differently
*/
printk(KERN_ALERT "bnx2i (%s): - WARN - CONN_DISCON timed out, "
"please submit GRC Dump, NW/PCIe trace, "
"driver msgs to developers for analysis\n",
hba->netdev->name);
}
ep->state = EP_STATE_CLEANUP_START;
timer_setup(&ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
ep->ofld_timer.expires = hba->conn_ctx_destroy_tmo + jiffies;
add_timer(&ep->ofld_timer);
bnx2i_ep_destroy_list_add(hba, ep);
/* destroy iSCSI context, wait for it to complete */
if (bnx2i_send_conn_destroy(hba, ep))
ep->state = EP_STATE_CLEANUP_CMPL;
wait_event_interruptible(ep->ofld_wait,
(ep->state != EP_STATE_CLEANUP_START));
if (signal_pending(current))
flush_signals(current);
del_timer_sync(&ep->ofld_timer);
bnx2i_ep_destroy_list_del(hba, ep);
if (ep->state != EP_STATE_CLEANUP_CMPL)
/* should never happen */
printk(KERN_ALERT "bnx2i - conn destroy failed\n");
return 0;
}
/**
* bnx2i_ep_connect - establish TCP connection to target portal
* @shost: scsi host
* @dst_addr: target IP address
* @non_blocking: blocking or non-blocking call
*
* this routine initiates the TCP/IP connection by invoking Option-2 i/f
* with l5_core and the CNIC. This is a multi-step process of resolving
* route to target, create a iscsi connection context, handshaking with
* CNIC module to create/initialize the socket struct and finally
* sending down option-2 request to complete TCP 3-way handshake
*/
static struct iscsi_endpoint *bnx2i_ep_connect(struct Scsi_Host *shost,
struct sockaddr *dst_addr,
int non_blocking)
{
u32 iscsi_cid = BNX2I_CID_RESERVED;
struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
struct sockaddr_in6 *desti6;
struct bnx2i_endpoint *bnx2i_ep;
struct bnx2i_hba *hba;
struct cnic_dev *cnic;
struct cnic_sockaddr saddr;
struct iscsi_endpoint *ep;
int rc = 0;
if (shost) {
/* driver is given scsi host to work with */
hba = iscsi_host_priv(shost);
} else
/*
* check if the given destination can be reached through
* a iscsi capable NetXtreme2 device
*/
hba = bnx2i_check_route(dst_addr);
if (!hba) {
rc = -EINVAL;
goto nohba;
}
mutex_lock(&hba->net_dev_lock);
if (bnx2i_adapter_ready(hba) || !hba->cid_que.cid_free_cnt) {
rc = -EPERM;
goto check_busy;
}
cnic = hba->cnic;
ep = bnx2i_alloc_ep(hba);
if (!ep) {
rc = -ENOMEM;
goto check_busy;
}
bnx2i_ep = ep->dd_data;
atomic_set(&bnx2i_ep->num_active_cmds, 0);
iscsi_cid = bnx2i_alloc_iscsi_cid(hba);
if (iscsi_cid == -1) {
printk(KERN_ALERT "bnx2i (%s): alloc_ep - unable to allocate "
"iscsi cid\n", hba->netdev->name);
rc = -ENOMEM;
bnx2i_free_ep(ep);
goto check_busy;
}
bnx2i_ep->hba_age = hba->age;
rc = bnx2i_alloc_qp_resc(hba, bnx2i_ep);
if (rc != 0) {
printk(KERN_ALERT "bnx2i (%s): ep_conn - alloc QP resc error"
"\n", hba->netdev->name);
rc = -ENOMEM;
goto qp_resc_err;
}
bnx2i_ep->ep_iscsi_cid = (u16)iscsi_cid;
bnx2i_ep->state = EP_STATE_OFLD_START;
bnx2i_ep_ofld_list_add(hba, bnx2i_ep);
timer_setup(&bnx2i_ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
bnx2i_ep->ofld_timer.expires = 2 * HZ + jiffies;
add_timer(&bnx2i_ep->ofld_timer);
if (bnx2i_send_conn_ofld_req(hba, bnx2i_ep)) {
if (bnx2i_ep->state == EP_STATE_OFLD_FAILED_CID_BUSY) {
printk(KERN_ALERT "bnx2i (%s): iscsi cid %d is busy\n",
hba->netdev->name, bnx2i_ep->ep_iscsi_cid);
rc = -EBUSY;
} else
rc = -ENOSPC;
printk(KERN_ALERT "bnx2i (%s): unable to send conn offld kwqe"
"\n", hba->netdev->name);
bnx2i_ep_ofld_list_del(hba, bnx2i_ep);
goto conn_failed;
}
/* Wait for CNIC hardware to setup conn context and return 'cid' */
wait_event_interruptible(bnx2i_ep->ofld_wait,
bnx2i_ep->state != EP_STATE_OFLD_START);
if (signal_pending(current))
flush_signals(current);
del_timer_sync(&bnx2i_ep->ofld_timer);
bnx2i_ep_ofld_list_del(hba, bnx2i_ep);
if (bnx2i_ep->state != EP_STATE_OFLD_COMPL) {
if (bnx2i_ep->state == EP_STATE_OFLD_FAILED_CID_BUSY) {
printk(KERN_ALERT "bnx2i (%s): iscsi cid %d is busy\n",
hba->netdev->name, bnx2i_ep->ep_iscsi_cid);
rc = -EBUSY;
} else
rc = -ENOSPC;
goto conn_failed;
}
rc = cnic->cm_create(cnic, CNIC_ULP_ISCSI, bnx2i_ep->ep_cid,
iscsi_cid, &bnx2i_ep->cm_sk, bnx2i_ep);
if (rc) {
rc = -EINVAL;
/* Need to terminate and cleanup the connection */
goto release_ep;
}
bnx2i_ep->cm_sk->rcv_buf = 256 * 1024;
bnx2i_ep->cm_sk->snd_buf = 256 * 1024;
clear_bit(SK_TCP_TIMESTAMP, &bnx2i_ep->cm_sk->tcp_flags);
memset(&saddr, 0, sizeof(saddr));
if (dst_addr->sa_family == AF_INET) {
desti = (struct sockaddr_in *) dst_addr;
saddr.remote.v4 = *desti;
saddr.local.v4.sin_family = desti->sin_family;
} else if (dst_addr->sa_family == AF_INET6) {
desti6 = (struct sockaddr_in6 *) dst_addr;
saddr.remote.v6 = *desti6;
saddr.local.v6.sin6_family = desti6->sin6_family;
}
bnx2i_ep->timestamp = jiffies;
bnx2i_ep->state = EP_STATE_CONNECT_START;
if (!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
rc = -EINVAL;
goto conn_failed;
} else
rc = cnic->cm_connect(bnx2i_ep->cm_sk, &saddr);
if (rc)
goto release_ep;
bnx2i_ep_active_list_add(hba, bnx2i_ep);
rc = bnx2i_map_ep_dbell_regs(bnx2i_ep);
if (rc)
goto del_active_ep;
mutex_unlock(&hba->net_dev_lock);
return ep;
del_active_ep:
bnx2i_ep_active_list_del(hba, bnx2i_ep);
release_ep:
if (bnx2i_tear_down_conn(hba, bnx2i_ep)) {
mutex_unlock(&hba->net_dev_lock);
return ERR_PTR(rc);
}
conn_failed:
bnx2i_free_qp_resc(hba, bnx2i_ep);
qp_resc_err:
bnx2i_free_ep(ep);
check_busy:
mutex_unlock(&hba->net_dev_lock);
nohba:
return ERR_PTR(rc);
}
/**
* bnx2i_ep_poll - polls for TCP connection establishement
* @ep: TCP connection (endpoint) handle
* @timeout_ms: timeout value in milli secs
*
* polls for TCP connect request to complete
*/
static int bnx2i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
{
struct bnx2i_endpoint *bnx2i_ep;
int rc = 0;
bnx2i_ep = ep->dd_data;
if ((bnx2i_ep->state == EP_STATE_IDLE) ||
(bnx2i_ep->state == EP_STATE_CONNECT_FAILED) ||
(bnx2i_ep->state == EP_STATE_OFLD_FAILED))
return -1;
if (bnx2i_ep->state == EP_STATE_CONNECT_COMPL)
return 1;
rc = wait_event_interruptible_timeout(bnx2i_ep->ofld_wait,
((bnx2i_ep->state ==
EP_STATE_OFLD_FAILED) ||
(bnx2i_ep->state ==
EP_STATE_CONNECT_FAILED) ||
(bnx2i_ep->state ==
EP_STATE_CONNECT_COMPL)),
msecs_to_jiffies(timeout_ms));
if (bnx2i_ep->state == EP_STATE_OFLD_FAILED)
rc = -1;
if (rc > 0)
return 1;
else if (!rc)
return 0; /* timeout */
else
return rc;
}
/**
* bnx2i_ep_tcp_conn_active - check EP state transition
* @bnx2i_ep: endpoint pointer
*
* check if underlying TCP connection is active
*/
static int bnx2i_ep_tcp_conn_active(struct bnx2i_endpoint *bnx2i_ep)
{
int ret;
int cnic_dev_10g = 0;
if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
cnic_dev_10g = 1;
switch (bnx2i_ep->state) {
case EP_STATE_CLEANUP_FAILED:
case EP_STATE_OFLD_FAILED:
case EP_STATE_DISCONN_TIMEDOUT:
ret = 0;
break;
case EP_STATE_CONNECT_START:
case EP_STATE_CONNECT_FAILED:
case EP_STATE_CONNECT_COMPL:
case EP_STATE_ULP_UPDATE_START:
case EP_STATE_ULP_UPDATE_COMPL:
case EP_STATE_TCP_FIN_RCVD:
case EP_STATE_LOGOUT_SENT:
case EP_STATE_LOGOUT_RESP_RCVD:
case EP_STATE_ULP_UPDATE_FAILED:
ret = 1;
break;
case EP_STATE_TCP_RST_RCVD:
if (cnic_dev_10g)
ret = 0;
else
ret = 1;
break;
default:
ret = 0;
}
return ret;
}
/**
* bnx2i_hw_ep_disconnect - executes TCP connection teardown process in the hw
* @bnx2i_ep: TCP connection (bnx2i endpoint) handle
*
* executes TCP connection teardown process
*/
int bnx2i_hw_ep_disconnect(struct bnx2i_endpoint *bnx2i_ep)
{
struct bnx2i_hba *hba = bnx2i_ep->hba;
struct cnic_dev *cnic;
struct iscsi_session *session = NULL;
struct iscsi_conn *conn = NULL;
int ret = 0;
int close = 0;
int close_ret = 0;
if (!hba)
return 0;
cnic = hba->cnic;
if (!cnic)
return 0;
if (bnx2i_ep->state == EP_STATE_IDLE ||
bnx2i_ep->state == EP_STATE_DISCONN_TIMEDOUT)
return 0;
if (!bnx2i_ep_tcp_conn_active(bnx2i_ep))
goto destroy_conn;
if (bnx2i_ep->conn) {
conn = bnx2i_ep->conn->cls_conn->dd_data;
session = conn->session;
}
timer_setup(&bnx2i_ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
bnx2i_ep->ofld_timer.expires = hba->conn_teardown_tmo + jiffies;
add_timer(&bnx2i_ep->ofld_timer);
if (!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic))
goto out;
if (session) {
spin_lock_bh(&session->frwd_lock);
if (bnx2i_ep->state != EP_STATE_TCP_FIN_RCVD) {
if (session->state == ISCSI_STATE_LOGGING_OUT) {
if (bnx2i_ep->state == EP_STATE_LOGOUT_SENT) {
/* Logout sent, but no resp */
printk(KERN_ALERT "bnx2i (%s): WARNING"
" logout response was not "
"received!\n",
bnx2i_ep->hba->netdev->name);
} else if (bnx2i_ep->state ==
EP_STATE_LOGOUT_RESP_RCVD)
close = 1;
}
} else
close = 1;
spin_unlock_bh(&session->frwd_lock);
}
bnx2i_ep->state = EP_STATE_DISCONN_START;
if (close)
close_ret = cnic->cm_close(bnx2i_ep->cm_sk);
else
close_ret = cnic->cm_abort(bnx2i_ep->cm_sk);
if (close_ret)
printk(KERN_ALERT "bnx2i (%s): close/abort(%d) returned %d\n",
bnx2i_ep->hba->netdev->name, close, close_ret);
else
/* wait for option-2 conn teardown */
wait_event_interruptible(bnx2i_ep->ofld_wait,
((bnx2i_ep->state != EP_STATE_DISCONN_START)
&& (bnx2i_ep->state != EP_STATE_TCP_FIN_RCVD)));
if (signal_pending(current))
flush_signals(current);
del_timer_sync(&bnx2i_ep->ofld_timer);
destroy_conn:
bnx2i_ep_active_list_del(hba, bnx2i_ep);
if (bnx2i_tear_down_conn(hba, bnx2i_ep))
return -EINVAL;
out:
bnx2i_ep->state = EP_STATE_IDLE;
return ret;
}
/**
* bnx2i_ep_disconnect - executes TCP connection teardown process
* @ep: TCP connection (iscsi endpoint) handle
*
* executes TCP connection teardown process
*/
static void bnx2i_ep_disconnect(struct iscsi_endpoint *ep)
{
struct bnx2i_endpoint *bnx2i_ep;
struct bnx2i_conn *bnx2i_conn = NULL;
struct bnx2i_hba *hba;
bnx2i_ep = ep->dd_data;
/* driver should not attempt connection cleanup until TCP_CONNECT
* completes either successfully or fails. Timeout is 9-secs, so
* wait for it to complete
*/
while ((bnx2i_ep->state == EP_STATE_CONNECT_START) &&
!time_after(jiffies, bnx2i_ep->timestamp + (12 * HZ)))
msleep(250);
if (bnx2i_ep->conn)
bnx2i_conn = bnx2i_ep->conn;
hba = bnx2i_ep->hba;
mutex_lock(&hba->net_dev_lock);
if (bnx2i_ep->state == EP_STATE_DISCONN_TIMEDOUT)
goto out;
if (bnx2i_ep->state == EP_STATE_IDLE)
goto free_resc;
if (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) ||
(bnx2i_ep->hba_age != hba->age)) {
bnx2i_ep_active_list_del(hba, bnx2i_ep);
goto free_resc;
}
/* Do all chip cleanup here */
if (bnx2i_hw_ep_disconnect(bnx2i_ep)) {
mutex_unlock(&hba->net_dev_lock);
return;
}
free_resc:
bnx2i_free_qp_resc(hba, bnx2i_ep);
if (bnx2i_conn)
bnx2i_conn->ep = NULL;
bnx2i_free_ep(ep);
out:
mutex_unlock(&hba->net_dev_lock);
wake_up_interruptible(&hba->eh_wait);
}
/**
* bnx2i_nl_set_path - ISCSI_UEVENT_PATH_UPDATE user message handler
* @shost: scsi host pointer
* @params: pointer to buffer containing iscsi path message
*/
static int bnx2i_nl_set_path(struct Scsi_Host *shost, struct iscsi_path *params)
{
struct bnx2i_hba *hba = iscsi_host_priv(shost);
char *buf = (char *) params;
u16 len = sizeof(*params);
/* handled by cnic driver */
hba->cnic->iscsi_nl_msg_recv(hba->cnic, ISCSI_UEVENT_PATH_UPDATE, buf,
len);
return 0;
}
static umode_t bnx2i_attr_is_visible(int param_type, int param)
{
switch (param_type) {
case ISCSI_HOST_PARAM:
switch (param) {
case ISCSI_HOST_PARAM_NETDEV_NAME:
case ISCSI_HOST_PARAM_HWADDRESS:
case ISCSI_HOST_PARAM_IPADDRESS:
return S_IRUGO;
default:
return 0;
}
case ISCSI_PARAM:
switch (param) {
case ISCSI_PARAM_MAX_RECV_DLENGTH:
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
case ISCSI_PARAM_HDRDGST_EN:
case ISCSI_PARAM_DATADGST_EN:
case ISCSI_PARAM_CONN_ADDRESS:
case ISCSI_PARAM_CONN_PORT:
case ISCSI_PARAM_EXP_STATSN:
case ISCSI_PARAM_PERSISTENT_ADDRESS:
case ISCSI_PARAM_PERSISTENT_PORT:
case ISCSI_PARAM_PING_TMO:
case ISCSI_PARAM_RECV_TMO:
case ISCSI_PARAM_INITIAL_R2T_EN:
case ISCSI_PARAM_MAX_R2T:
case ISCSI_PARAM_IMM_DATA_EN:
case ISCSI_PARAM_FIRST_BURST:
case ISCSI_PARAM_MAX_BURST:
case ISCSI_PARAM_PDU_INORDER_EN:
case ISCSI_PARAM_DATASEQ_INORDER_EN:
case ISCSI_PARAM_ERL:
case ISCSI_PARAM_TARGET_NAME:
case ISCSI_PARAM_TPGT:
case ISCSI_PARAM_USERNAME:
case ISCSI_PARAM_PASSWORD:
case ISCSI_PARAM_USERNAME_IN:
case ISCSI_PARAM_PASSWORD_IN:
case ISCSI_PARAM_FAST_ABORT:
case ISCSI_PARAM_ABORT_TMO:
case ISCSI_PARAM_LU_RESET_TMO:
case ISCSI_PARAM_TGT_RESET_TMO:
case ISCSI_PARAM_IFACE_NAME:
case ISCSI_PARAM_INITIATOR_NAME:
case ISCSI_PARAM_BOOT_ROOT:
case ISCSI_PARAM_BOOT_NIC:
case ISCSI_PARAM_BOOT_TARGET:
return S_IRUGO;
default:
return 0;
}
}
return 0;
}
/*
* 'Scsi_Host_Template' structure and 'iscsi_tranport' structure template
* used while registering with the scsi host and iSCSI transport module.
*/
static struct scsi_host_template bnx2i_host_template = {
.module = THIS_MODULE,
.name = "QLogic Offload iSCSI Initiator",
.proc_name = "bnx2i",
.queuecommand = iscsi_queuecommand,
.eh_timed_out = iscsi_eh_cmd_timed_out,
.eh_abort_handler = iscsi_eh_abort,
.eh_device_reset_handler = iscsi_eh_device_reset,
.eh_target_reset_handler = iscsi_eh_recover_target,
.change_queue_depth = scsi_change_queue_depth,
.target_alloc = iscsi_target_alloc,
.can_queue = 2048,
.max_sectors = 127,
.cmd_per_lun = 128,
.this_id = -1,
.sg_tablesize = ISCSI_MAX_BDS_PER_CMD,
.shost_groups = bnx2i_dev_groups,
.track_queue_depth = 1,
.cmd_size = sizeof(struct iscsi_cmd),
};
struct iscsi_transport bnx2i_iscsi_transport = {
.owner = THIS_MODULE,
.name = "bnx2i",
.caps = CAP_RECOVERY_L0 | CAP_HDRDGST |
CAP_MULTI_R2T | CAP_DATADGST |
CAP_DATA_PATH_OFFLOAD |
CAP_TEXT_NEGO,
.create_session = bnx2i_session_create,
.destroy_session = bnx2i_session_destroy,
.create_conn = bnx2i_conn_create,
.bind_conn = bnx2i_conn_bind,
.unbind_conn = iscsi_conn_unbind,
.destroy_conn = bnx2i_conn_destroy,
.attr_is_visible = bnx2i_attr_is_visible,
.set_param = iscsi_set_param,
.get_conn_param = iscsi_conn_get_param,
.get_session_param = iscsi_session_get_param,
.get_host_param = bnx2i_host_get_param,
.start_conn = bnx2i_conn_start,
.stop_conn = iscsi_conn_stop,
.send_pdu = iscsi_conn_send_pdu,
.xmit_task = bnx2i_task_xmit,
.get_stats = bnx2i_conn_get_stats,
/* TCP connect - disconnect - option-2 interface calls */
.get_ep_param = bnx2i_ep_get_param,
.ep_connect = bnx2i_ep_connect,
.ep_poll = bnx2i_ep_poll,
.ep_disconnect = bnx2i_ep_disconnect,
.set_path = bnx2i_nl_set_path,
/* Error recovery timeout call */
.session_recovery_timedout = iscsi_session_recovery_timedout,
.cleanup_task = bnx2i_cleanup_task,
};